Shearing attachment for anvils.



No. 717,658. IATBNTBD JAN. 6,1993.

o. A. GHRISTBNSON.

SERING ATTACHMENT FOB.l ANVILS.

APPLICATION FILED DEU. 19, 1901.

F0 MODEL.

of material into pieces of equal length when 'Unire Sra'rns CHRISTIAN A. OHRISTESON, OF VIROQA, WISCONSIN, ASSIGNOR TO LOUISE C. OHRISTENSON,

OF VIROQUA, WISCONSIN.

SHEARING ATTACHMENT FOR ANVILS.

SPECIFICATION forming part of Letters Patent No. 717,658, dated January 6, 1903.

Application tiled December 19, 1901. Serial No. 36,540.v (No model.)

Yreadily-attachable shearing device of novel construction for an ordinary anvil, such as is used by blacksmiths doing a general run of Work in rural districts, and thus afford convenient means for shearing plate or barVA metal into form as occasion may require; and

a further object is to provide an improved gage as a coacting detail for the shearing device that greatly facilitates the subdividing this is required.

The invention consists in the novel construction and combination of parts, as is hereinafter described, and defined in the appended claims.

Reference is to be had to the accompanying drawings, forming a part of this specification, in which similar characters of reference indicate corresponding parts in all the gures.

Figure 1 isa perspective view of an anvil and of the improved shearing device mounted thereon. Fig. 2 is a fragmentary partly-sectional side view of the heel portion of an al1- vil and of the shearing device held thereon. Fig. 3 is a partly-sectional planv view 'of the shearing device and the gage thereon, sub-v stantially on the line 3 3 in Figi; and Fig. 4 is an enlarged detached side'view of the gage device. f

In the drawings, A indicates an anvil-supporting block of suitable dimensions, and 10 an anvil of the usual construction mounted on said block. A base-plate 1l is placed upon the face of the anvil and located near the heel of the same, the base-plate being held in place by means of the square-bodied shank of a bolt 12, that is rounded and threaded at the upper end, as at ct,`which end screws into a tappet-'hole inthe base-plate, as shown in Fig. 2, the shank being fitted neatly into a square hole formed vertically in the heel portion of the anvil for the reception of a mating l shank on a cuttingtool known as a hardy,

common to all blacksmiths anvils.

It will be seen that the frictional engagement of the shank 12 in the squared hole mentioned serves toretain the base-plate 11 imposition so that its side edges are always disposed parallel with the side edges of the anvil. The base-plate 11 overlaps the face of the anvil at one side, and a notch, preferably square in form,'is cut in the overhanging portion of the base-plate, said notch b loosely receiving the rectangular body of the slide-bar 13, which is held from displacement by a clamping-strip 14, that seats upon the edge of the base-plate, over the notch therein, and .is secured theretoby set-bolts c. The slide-bar 13 is of such a length as permits it to extend considerably above the anvil-face and also below it. I

At the base of the' anvil a looped bracketbar 15 is secured, the looped portion dthereof `loosely'embracing the slide-bar 13, so as to retain the latter free to slide in a vertical plane. Y

, A pintle-bar 16 is secured upon the 'block A transverselyand parallel with the clampingstrip 14 it is below, the `journal ende thereon projecting at the side of the block that is parallel withthe rear side of the slide-bar 13, which at the lower end lies near to said side ofthe anvil-supporting block. Upon the journal end c the perforated'lower end g on the treadle-lever 17 is loosely mounted, said lever extending across the block A and beyond it sufficiently to permit a foot-plate h, that'is at this extremity ot' the lever, to receive pressure from the footof an operator. The treadle-lever 17 is normally supported in an upwardly and outwardly inclined position by the retractile force of the coiled spring 18, that has hooked engagement therewith at the lower end of the spring, a like engagement being effected between the upper end of said spring and a downward extension of the boltbody 12 below the heel of the anvil, as shown in Fig. 1.

vUpon the lower end of the s1ide-bar 13 one end of the link-bar 19 is pivotally connected, as shown at i in Fig. 1, said link-bar having a furcated lower portion providing two spaced limbs 2O thereon. A series of spaced perfora- IOO tions lm, is formed in the limbs 20 and spaced perf orations n are formed in the treadle-lever 17, these perforations in the link-bar limbs and treadle-lever being designed to receive a connecting-bolt o, that may be shifted to pass through appropriate holes in said parts for giving a proper inclination to the treadlelever, so that a change in tensional force of the spring 18 may be compensated for in an obvious manner.

The improved shears comprise two cuttingblades 2l 22, that have alapped engagement at one end and are held together at said ends by a pivot-bolt 19, which occupies alined perforations therein, as shown in Figs. 1, 2, and 3. The lower blade 21 is in the form of a straight bar that is provided with a pad-like engagement 7' at the end opposite from the end that is pivoted upon the upper blade 22, said pad being perforated to receive a screwbolt s, that engages a tapped hole in the baseplate 11, as indicated by dotted linesin Fig. 2.

The rockable cutting-blade 22 is preferably coucaved on the lower or cutting edge, which adapts it to have a more perfectshearing action when vibrated, the adjacent edges of the blades 21 22 being suitably beveled to render them serviceable, as indicated by full and dotted lines in Fig. 2.

The slide-bar 13 may with advantage be thickened or reinforced for a portion of its length above the traverse of the upper shearing-blade 22, this being preferablyeected by securing a metal block 13 thereupon, as shown in Figs. 1 and 2, the lower end of said block being spaced from the upper cuttingblade and provided with a tongue t, which receives the `upper slotted body of the pressure-foot 13b and-is thereto pivoted, as indicated at t in Fig. 2.

The rockable pressure-foot 13b is convexed on the lower side for engagement with a concavity in the upper edge of the cutting-blade 22 near its free end, and the latter is held in enforced contact with the pressure-foot by a spring 13C, which has its ends respectively engaged with the upper end of the reinforcingblock 13a and with the upper cutting-blade 22, as shown in Figs. 1 and 2.

As before mentioned, a feature of the invention is to provide a gage of novel construction to coact with the shears, so that any desired length of material within the range of the gage may be successively cut from a plate or bar of metal by use of the gage, together with the shears. As shown, the gage comprises a carrier-bar 23, having a gage-plate 24 secured upon one of its ends and projecting at a right angle thereto.

Upon the carrier-bar 23 a clamping-block 25 is slidably mounted and adapted for detachable fixture thereon by provision of the set-screw 26, that screws into a projection on the. block below the carrier-bar, whereupon it may be pressed b v proper screwed adjustment, as indicated in Fig. 4. The block 25 is provided with two spaced jaws 25a 25h, that project upwardly therefrom, and through one jaw 25 the set-screw 27 is screwed so that its point may extend more or less in the space between the jaws and have contact with material introduced between them.

1t will be seen that the gage may be mounted upon the stationary lower blade of the shears by retracting the set-screw 27 sufficiently to permit the jaws of the block 25 to pass upward each side of the rear portion of the lower cuttingblade 21, that extends beyond the heel of the anvil, the subsequent tightening of the set-screw 27 against an adjacent side of the shear-blade 21 serving to firmly secure the block 25 upon said blade and dispose the carrier-bar 23 at right angles thereto.

It will be seen that the carrier-bar 23 may be readily changed in adj ustment-within the block 25 by an obvious adjustment of the setscrew 26, so as to move the gage-plate any desired distance from the cutting edge of the lower blade 21 and in said plate 24 afford an abutment to determine the length of pieces of metal to be successively cut from a plate or bar of metal, it'being understood that prior to each shearing cut of the upper blade 22 the plate or bar is shifted endwise, so that it will abut upon the gage-plate.

Asthe treadle-lever 17 affords considerable leverage and is so positioned that the weight of the operator may be applied thereto, it will be evident that foot-pressure on the treadlelever will be adapted to vibrate it easily and that a desired number of pieces of metalhot or coldmay be rapidly cut to a desired length by use of the shears and gage. It is to be understood, however, that in use of the shears for general purposes the gage may be removed if not needed.

It will be seen that by lubricating the contacting surfaces of the active upper shearingblade 22 and pressure-foot 13" friction may be reduced to a minimum and the power applied be utilized to great advantage.

Having thus described my invention, I claim as new and desire to secure by Letters Patent- 1. The combination with an anvil, and a slide-bar held to reciprocate at one side of said anvil, of a treadle-lever pivoted by one end and raised by a spring, a stationary shearblade held on the anvil,a rockable shear-blade pivoted by one end on an end of the stationary shear-blade, a spring for connecting the rockable shear-blade to the slide-bar for elevation of the blade when the slide-bar moves upward, and means to adapt the depression of said bar to rock the shear-blade downward.

2. The combination with an anvil, a slidebar held to reciprocateat one side of the anvil, a treadle-lever pivoted by one end. and extending transversely below the anvil, a spring adapted to rock the treadle-lever upward, and a link-bar jointed upon the slidebar and treadle-lever, of a shear-blade stationary on the anvil, a rockable shear-blade pivoted by one end on an end of the station- IOO ary shear-blade, a spring connecting the rockl and a gage device held on the stationary shear- 1 able blade with the slide-bar to raise said blade when the bar moves upward, and a pressure-foot rockable on the slide-bar and pressing on the rockable blade.

3. The combination with an anvil, a bar vertically slidable bereon, and a treadle-lever adapted to reciprocate the slide-bar, of a stationary shear-blade seated upon the anvil, an upper rockable shear-blade pivoted by one end on an end of the stationary blade, means to adapbthe slide-bar to rock the upper blade,

blade comprising an adjustable carrier-rod and a gage-plate on one end of said rod par- 15 allel with the shear-blades.

In testimony whereof I have signed my name to this specification in the presence of two subscribing Witnesses.

CH RISTIAN A. CHRISTEN SON.

Witnesses:

W. H. PUKER, D. H. PUKER. 

